Sanding machine



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Dec. 74, 1937. F. o. ALBERTSON SANDING MACHINE 2 sheets-sheet 2 Filed Aug. 1s, 1957 N LOM @im Patented Dec. 7, 1937v UNITED STATES PATENT FFICE SANDIN G MACHINE Frans O. Albertson, Sioux City, Iowa, assignor to Albertson & Company, Inc., Sioux City, Iowa, a corporation of Iowa Application August 13, 1937, Serial No. 158,857

2 Claims. (Cl. 51170) The present invention relates to sanding mameans of an electric switch located in housing I2. chines, and is particularly concerned with a sand- The foregoing elements are preferably located in ing machine of the type comprising an electric line with each other and with a handle I3 through motor, speed reduction gearing and a rotatable which the electric connection cord I4 extends.

5 sanding disc, in which provision has been made The motor housing I!! is closed at one end with for more than one denite range of speed. a cover plate I5, which is provided with bearing In such sanding machines the speed is ordinameans for the motor drive shaft I6, which is prorily determined by the power of the motor, the vided at its end with a pinion I1. gearing and the load which is put upon the sand- The gear housing l I and cover plate I 5 rotating disk, and for any given' machine there is a ably support a stub shaft I8 (Fig. 4), to which is l0 proper load pressure which results in the best keyed a gear I9 which meshes with the pinion I1 operation. as shown in Figs. 3 and 4. The gear observed in It is, however, desirable to have a machine Fig. 4 below the pinion I1 does not mesh with it which will operate at two different normal speeds, as it appears, because they are in different planes.

'15 land one of the objects of the invention is the pro- The stub shaft I8 is provided with two gears 20 15:

vision of an improved sanding machine which is and 2I, which are non-rotatably but slidably provided with a gear reduction arrangement mounted on the stub shaft I8 by means of a sliding adapted to effect a change of speed of the sandkey and keyway 22. Gears 20, 2l may be fastened ing disc. together, and the gear is provided on its left- 20 Another object of the invention is the provision hand face with a hub 23 having a peripherally 20 of an improved sanding machine of the class deextending slot 24 for receiving a yoke 25. The scribed in which the speed of rotation of the sandyoke 25 comprises a metal member having a pair ing wheel may be changed by changing the gear of spaced arms 26, 21, one on each side of shaft I8, ratio of the reduction gearing which is interposed and yoke 25 is xedly mounted on a push rod 28,

25 between the motor and sanding machine. which is slidably mounted in abore 29.

Another object of the invention is the provision The gear housing I I has a slot at to accomof an improved arrangement of the class demodate the push rod and its thumb piece 3|, scribed, which is also adapted to be used upon which is xedly secured to the end of the push polishing machines so that a relatively low speed rod by 'means of a screw bolt 32. One may thus 30 may be used When the initial rubbing of the wax take hold of the push button 3| and cause the rod 30 is made, and a high speed may be used when the 28 to slide to the left or right to change the posijob is finally polished 01T. tion of the gears 20, 2|.

Other objects and advantages of the invention. In Fig. 3 the push rod and gear 20 is at the will be apparent from the following description extreme left position. The gear housing II also and accompanying drawings in which similar rotatably supports a second stub shaft 33 which 35 characters of reference indicate similar parts. is rotatably mounted in bearings 34, 35 in the throughout the several views. gear housing and cover plate I5. This stub shaft Referring to the drawings, of which there are ixedly supports a pair of gears, such as the pintwo sheets: ion 36 and spur gear 31, and the pinion 36 is of 40 Fig. 1 is a top plan view of a sanding machine such size that it meshes with the gear 20. The 40 with the disc disposed downwardly embodying spur gear 31 is of such size and is so located that the invention with a part of the housing broken it meshes with the gear 2I when the gear 2l is away to show the speed changing gears; brought into the proper plane by means of the Fig. 2 is a side elevational View of the sanding push rod 28. machine; As the pinion 36 and gear 20 present a diifer- 45 Fig. 3 is a vertical sectional View taken on the ent gear ratio from that of the spur gear 31 and plane of the line 3-3 of Fig. 1 looking in the digear 2|, it is possible to change the speed at which rection of the arrows showing the details of conthe stub shaft 33 is driven by the motor Ill. The struction of the speed reduction gearing; and stub shaft 33 carries a pinion 38 which is adapted Fig. 4 is a sectional View taken on the plane of to mesh with a crown gear 39 carried by the spin- 50 the line 4-4 of Fig. 3 looking in the direction of dle 40. The spindle 40 is rotatably mounted at the arrows. its upper end upon a ball bearing 4I located in a The sanding machine preferably comprises an socket in the gear housingv I I, and at its lower electric motor I0 provided with a speed reduction end upon a ball bearing 42 which is mounted in gearing located in housing II and controlled by a socket in the cover plate 43. 55

Cover plate 43 closes the open end of a gear housing I I and is secured in place by a plurality of screw bolts 44. It preferably has an enlarged bore 45 surrounding the spindle for receiving the oil seal 46, which comprises a hat leather 41, a

garter spring 48 and an oil seal housing 49. The garter spring 48 draws the leather 4'I into engagement with the cylindrical portion 5U of spindle 40. At its outer end spindle 40 has an enlarged annular ange 5I, which is provided with a plurality of apertures 52.

A pivoted lever 53 is mounted on the gear housing I I and has a pin 54 which may be moved into any one of the apertures 52 to secure the spindle 40 in xed position. At its outer end the spindle 40 is also provided with a reduced threaded p0rtion 55 which is adapted to be received in the complementary threaded bore 56 of the hub 51 of a sanding wheel 58.

The sanding wheel usually comprises a sheet metal backing 59 to which is riveted or otherwise xedly secured a rubber disc 5D having secured upon it a polishing bonnet or a sanding disc 6I. By means of the gear shifting arrangement controlled with the thumb button 3| it is possible to rotate the sanding disc 6I at two different speeds. Relatively fast rotation may be secured for certain sanding operations, and a slower and more powerful action may be secured for other operations.

It will thus be observed that I have invented an improved sanding machine having a two speed gear arrangement; the ratio of the speed reduction gearing being used may be very quickly changed by merely reciprocating the push rod 28. Push rod 28 is held in either of its two positions by means of a spring-pressed ball 62 which is mounted in a bore 63 and engaged by a spring 64 reacting against a screw plug 65.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an electric sanding and polishing machine, the combination of an electric motor having a drive shaft and housing, with a gear housing carried by said motor housing, speed reduction gearing located in said gear housing, a drive spindle rotatably mounted in said gear housing and projecting therefrom, said drive spindle being operatively connected to said motor through said speed reduction gearing, and said drive spindle having a threaded portion, a sanding Wheel having a hub provided with a complementary threaded portion, said sanding wheel being adapted to support operating tools, a thrust collar carried by said drive spindle, said thrust collar being provided with a radially extending socket, and a pivoted lever carried by said gear housing, said pivoted lever being mounted in a pivot extending substantially parallel to said drive spindle, and having a transversely extending cylindrical lug adapted to be received in said socket whereby the spindle may be secured and held in fixed position by means of said pivoted lever, while the sanding wheel is threaded on or oi the threaded portion of said drive spindle.

2. In an electric sanding and polishing machine, the combination of an electric motor having a drive shaft and housing, with a gear housing carried by said motor housing, gearing located in said gear housing, a drive spindle rotatably mounted in said gear housing, said drive spindle being operatively connected to said motor through said gearing, and said drive spindle having a threaded portion, an operating tool carried by a complementary threaded member mounted on said drive spindle, said member being provided with an inwardly extending socket, and a pivoted lever carried by said gear housing, said pivoted lever being mounted in a pivot extending substantially parallel to said drive spindle, and having a transversely extending lug adapted to be received in said socket whereby the spindle may be secured and held in xed position by means of said pivoted lever, while the sanding wheel is threaded on or oif the threaded portion of said drive spindle.

FRANS O. ALBERT-SON. 

